# 7.11.3.9 IfcReinforcementDefinitionProperties

## 7.11.3.9.1 Semantic definition

IfcReinforcementDefinitionProperties defines the cross section properties of reinforcement included in reinforced concrete building elements. The property set definition may be used both in conjunction with insitu and precast structures.

This subtype of IfcPropertySetDefinition is used to define the reinforcement properties in early design stages, such as in requirement definition or scheme design. In later design stages explicit instances of subtypes of IfcReinforcingElement are used. The intended usage may be indicated using the DefinitionType attribute value as a designator: recommended values are 'Reinforcement area requirement' or 'Reinforcement configuration requirement'. Other values may be used according to local standards.

Only one property set definition of this kind is used for each concrete building element in each intended usage indicated by the DefinitionType attribute value. This set then defines a list of cross section properties in a discrete number of longitudinal sections as instances of IfcSectionReinforcementProperties (one for each structural reinforcement bar role), which in turn have a section cross section property defined as a profile and a number of reinforcement properties, one for each steel grade / bar type.

## 7.11.3.9.5 Formal representation

ENTITY IfcReinforcementDefinitionProperties
SUBTYPE OF (IfcPreDefinedPropertySet);
DefinitionType : OPTIONAL IfcLabel;
ReinforcementSectionDefinitions : LIST [1:?] OF IfcSectionReinforcementProperties;
END_ENTITY;